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const npa = require('npm-package-arg')
// extracted from npm v6 lib/install/realize-shrinkwrap-specifier.js
const specFromLock = (name, lock, where) => {
try {
if (lock.version) {
const spec = npa.resolve(name, lock.version, where)
if (lock.integrity || spec.type === 'git') {
return spec
}
}
if (lock.from) {
// legacy metadata includes "from", but not integrity
const spec = npa.resolve(name, lock.from, where)
if (spec.registry && lock.version) {
return npa.resolve(name, lock.version, where)
} else if (!lock.resolved) {
return spec
}
}
if (lock.resolved) {
return npa.resolve(name, lock.resolved, where)
}
} catch {
// ignore errors
}
try {
return npa.resolve(name, lock.version, where)
} catch {
return {}
}
}
module.exports = specFromLock
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